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The evolution of network technologies brought increasing management complexity of networking infrastructure and protocols. Cognitive networking was introduced to deal with such complexity. This work presents a cognitive algorithm for cross-layer performance management which is the core of a decentralized framework for self-configuration of communication protocols. We illustrate the proposed solution...
The IEEE 802.16 mesh network is a promising next generation wireless backbone network. Under Coordinated Distributed Scheduling (CDS) mode, setting the holdoff time for nodes is essential to achieving good performances of medium access control layer scheduling in the networks. In this paper, we propose a dynamic scheme for setting holdoff time in IEEE 802.16 mesh mode with CDS. This scheme allows...
Due to the energy-constrained nature of wireless sensor networks (WSNs), a variety of communication protocols which rely on cluster-based topologies to enhance network capacity or to prolong network operational lifetime have been well studied heretofore. In this paper, we instead study a comprehensive perspective that searches for an optimal operation that considers backbone node placement and communication...
Traditional medium access control (MAC) protocols utilize temporal mechanism to do contention resolution. This paper explores an alternative approach by adapting the space occupied by a transmission to resolve contention. Each successful transmission in a wireless network needs to occupy a certain part of space in which there are no other simultaneous transmissions. The size of the space occupied...
We consider multi-channel multi-interface wireless mesh networks with a schedule-based MAC protocol, where conflict-free transmission is ensured by requiring links assigned with the same channel and within the mutual interference range of each other to be active at different time slots. When a (point-to- multipoint) multicast call arrives, the call is accepted if a multicast distribution tree can...
In this paper, we propose the EDCA-TM, a new architecture which tunes the enhanced distributed channel access (EDCA) for multi-hop networks. In EDCA-TM, we suggest a new module for dynamic access category adaptation (DACA) over the existing channel access mechanism such as EDCA. It processes received data packets for assigning an appropriate access categories (AC) to provide delay and rate guarantee...
The original topology-transparent TDMA protocol does not perform effectively because of the collisions. In this paper a dynamic topology-transparent TDMA protocol with a novel collision-free algorithm for mobile ad hoc networks is presented. This method avoids collisions utilized the active information of two-hop nodes and dynamically adapts time-slot assignment to the changes of topology and load...
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